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Dec. 3, 1946.
j
D
_ A_ J, FORD
MECHANICAL GRINDING STONE
2,412,141~
.
Filed May 7, 1945
„WWW
INVENTOR.`
l
2,412,141
Patented Dec. 3, 1946
AUNITED STATES PATENT
2,412,141
OFFICE
MECHANICAL GRINDING STONE
Asa J. Ford, Kansas City, Kans.
Application May 7, 1945, Serial No. 592,455
2 Claims.
1
This invention relates to grinding equipment
of the type employed in sharpening tools, and the
primary aim is the provision of such equipment
wherein the abrading stone is moved through its
path of travel by power driven elements, all to
the end that the operator may hold the tool being
sharpened in a stationary condition while the
cutting edge is being formed thereon.
One of the important objects of this invention
is to provide a mechanical grinding stone, the 10
2
illustrated, and the same comprises a table, gen
erally designated by the numeral I0, in the top
of which is formed a cavity I2 for the reception of
a number of gears I4, IB and I8 respectively.
Gear I6 is intermediate gears I4 and I8 and is
mounted upon a shaft 20 journalled in table I8
Vand extending vertically therethrough to a point
beneath table I0 where bevel gear 22 is affixed
thereto. This bevel gear 22 is in mesh with an
other bevel gear 24 on shaft 26, journalled in
bearing 28. A pulley wheel 30 on shaft 26 is the
medium through which power may be applied to
work bench where actuation of the movable parts
the train of gears I4, I6 and I8. A V-belt may
may be caused through the application of power
be passed over pulley 30 and thence over a pulley
from a small motor.
Other objects of the invention include the pro 15 on a motor or other source of power, not here
shown.
vision of a grinding stone of the aforementioned
Gears I4 and I8 each is providedwith a peg 32
type wherein the stone is held for travel through
disposed eccentrically with respect to the center
an orbital path; the support for the stone com
of rotation and these Apegs project vertically and
prises a housing for a train of gears specially de
signed to motivate the stone; the stone may be 20 upwardly through openings 34 formed in a plat
nature whereof permits mounting the same on a
easily removed without manipulating set screws,
clamps or other manually operable instrumental
ities; the stone and its holder is positioned close
to a supporting rail designed to steady the oper
ator’s hand and the work; and the support for 25
form 36 constituting the top ~of the table. This
platform 36 has a smooth, horizontal upper sur
face over which holder 38 may ride when the
grinding stone is in operation. Holder 38 has
sockets 48 to receive the respective pegs 32 and a
grinding stone 42 is secured in any suitable fash
the stone is in the nature of a tablel adapted to
house the gear train through the medium where
ion to holder 38, to the end that the upper-surface
thereof is presented for use.
of power is applied.
Other objects of the invention will appear dur
A rail 44 is mounted on platform 36 and ex
ing the course of the following specification, re 30 tends longitudinally along one edge thereof and
ferring to the accompanying drawing, wherein:
adjacent to stone 42 where the operator may con
veniently employ the same as a rest for his hand
Fig. 1 is a top plan view of the mechanical
as the tool is held against stone 42.
grinding stone embodying the present invention,
parts being broken away for convenience of illus
When power is applied the train of gears hav
tration.
35 ing elements I 4 and I 8 therein will serve to rotate
pegs 32 through like circular paths to smoothly
Fig. 2 is a vertical longitudinal sectional view
shift holder 38 and the stone 42 along a path of
taken on line II-II of Fig. 1; and
travel that is kindred to the path which is nor
Fig. 3 is a fragmentary vertical central sec
tional view showing the manner of connecting
mally established by the tool when being sharp
the equipment to a source of power.
40 ened through the conventional hand method.
The operator need only hold the tool at the
It is common knowledge that workmen have
proper angle, whereupon stone 42 will function
without the expenditure of the operator’s energy
other than that required to hold the tool against
tool being treated, is usually through a path of 45 the face of stone 42 with the required amount of
pressure.
travel substantially orbital or in part, arcuate.
Advantages arising from a mechanical stone
Unless the tool is held at a precise angle and with
skill and knowledge, the edge created is not true
grinder made as above described, will be obvious
and the beveled portion is not of a form that pro
to those skilled in the art, and they will likewise
duces best results.
.
50 understand that modifications may be made
without departing from the spirit ofthe invention
To overcome this “human” element and to in
heretofore sharpened tools of all description by
drawing the same over the surface of abrading
stones and that the movement imparted to the
sure uniformity of pressure, movement and re
or scope of the appended claims.
Having thus described the invention, what is
sults, the mechanical grinding stone illustrated
in the accompanying drawing has been designed.
claimed as new and desired to be secured by Let
Only the preferred form of the invention has been 55 ters Patent is:
-
2,412,141
3
1. A mechanical grinding stone comprising a
table having a flat, horizontal top provided with
openings in the latter; agrinding stone slidably
openings in the latter; a grinding stone slidably
mounted on the table top and having sockets
formed in the bottom thereof; a power driven
shaft carried by the table; a train of gears be
mounted on the table top and having sockets
formed in the bottom thereof; a power driven
shaft carried by the table; a train of gears be
neath the table top; pins, eccentrically mounted
neath the table top; pins, eccentrically mounted
wardly through the openings in the table top and
on at least two of the gears and projecting up
on at least two of the gears and projecting up
into the sockets of the stone holder; and struc
wardly through the'openings in the tablel top `and
into the sockets oÍf 'the stone holder; `and struc
ture operatively interconnecting the shaft and
the train of gears to rotate the pins whereby to
slide the stone holder through an orbital path
ture operatively `interconnecting 'the fshaft and
the train‘o‘f gears to rotate Athe pins whereby to
slide the stone holder through an orbital path
over the table top, said table top having a sta
tionary rail thereon adjacent to the stone holder
for supporting the hands of the user as the grind
over the table top.
2. A mechanical grinding stone comprising a '15 ing stone is being used.
table having a flat, horizontal top provided with
ASA J. FORD.
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